hess's law question.

hess's law question. (grd 12 chemistry)

The way I am supposed to answer is using the balance and cross out method. I have not learned any specific equations, but to either flip the equation (create to either negative or positive enthaply), or to multiply and divide the the equation (do the same to the enthaply as well). Not all of the equations are required to find the answer.

1. Given the following equations and A H values determine the heat of formation for nitroglycerine, CH.N.O. N2 + 0x8) + 34 kJ C + 026) + O2 CH,NGOt + 11/4 Og). NO29 CO2 HO + 394 kJ HA AH-242 kJ = -1540 kJ - 3 C02W + 5/2 H,02 + 3 NO2W MacBook Pro